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Author

Yanfen Geng

Bio: Yanfen Geng is an academic researcher from Southeast University. The author has contributed to research in topics: Permeability (earth sciences) & Pore water pressure. The author has an hindex of 2, co-authored 5 publications receiving 11 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, an innovative device was proposed to evaluate the anisotropy of permeability influenced by clogging, and the maximum drainage capacity without surface ponding can be obtained when the supplied water was controlled.
Abstract: The purpose of this paper is to report on the drainage of porous asphalt pavement evaluation method suited for use in analyzing clogging effect. To preliminarily reveal the decrease in permeability caused by clogging of permeable asphalt pavement, an innovative device was proposed to evaluate the anisotropy of permeability influenced by clogging, and the maximum drainage capacity without surface ponding can be obtained when the supplied water was controlled. Then, finite element models for asphalt pavements with hydromechanical coupling were proposed based on porous media theory and Biot’s theory. The variation in pore water pressure was simulated by considering the decrease in voids and the increase in clogging grains. The results indicate that the internally retained water should not be ignored because the semiconnected voids were filled with water rapidly at the beginning of permeability tests. To avoid surface ponding, the drainage capacity coefficient (DCC) can be used to evaluate the maximum drainage capacity (MDC) influenced by clogging. Moreover, the pore water pressure increased due to the reduction in voids and a high level of clogging. In addition, the peak value of pore water pressure is also affected by the upper-layer height of the pavement. Under the action of clogging and driving load, a reasonable thickness of the upper layer and a drainage evaluation should be considered to improve road safety.

8 citations

Journal ArticleDOI
Xianhua Chen1, Yanfen Geng1, Jiang Qinglin, Xiaoming Huang1, Yaolu Ma1 
TL;DR: In this paper, an innovative approach to characterize the flow field characteristics of pavement rainfall runoff is presented, which is essential for highway drainage design and skid management, and the results show that the approach is more accurate than previous methods.
Abstract: Knowing the flow field characteristics of pavement rainfall runoff is essential for highway drainage design and skid management. This paper presents an innovative approach to characterize t...

4 citations

Journal ArticleDOI
01 Dec 2020
TL;DR: In this paper, a simulation model for predicting pavement alignment is proposed to obtain the water distribution influenced by pavement alignment design under the current situation of highway reconstruction and extension in China, and the simulation model is used for predicting pave...
Abstract: To obtain the water distribution influenced by pavement alignment design under the current situation of highway reconstruction and extension in China, a simulation model for predicting pave...

4 citations

Patent
04 Jan 2019
TL;DR: In this paper, a measurement device and an assessment method of transverse permeability of an asphalt mixture is presented. But the measurement device is simple in structure and flexible to operate, can perform tests by use of the standard asphalt mixture test piece of an indoor formed or on-site core sample and objectively reflects the transversal permeation process of moisture in the asphalt test piece.
Abstract: The invention discloses a measurement device and an assessment method of transverse permeability of an asphalt mixture. By the aid of a self-designed a water permeability testing device for an asphaltmixture test piece, the retained water volume in the asphalt mixture test piece is obtained through test with a water volume control method according to a water volume balance principle; the permeation and water permeation type of the asphalt mixture test piece is qualitatively recognized according to existence of the permeation water volume; the vertical permeability, diffusion permeability andlateral permeability in the test piece are quantized according to the permeation water volume to obtain the retained water volume, the vertical permeation coefficient, the diffusion permeation coefficient and the lateral permeation coefficient and other indexes of the asphalt mixture test piece to assess the transverse permeability of the asphalt mixture test piece. The measurement device is simple in structure and flexible to operate, can perform tests by use of the standard asphalt mixture test piece of an indoor formed or on-site core sample and objectively reflects the transverse permeation process of moisture in the asphalt mixture test piece.
Proceedings ArticleDOI
02 Jul 2019

Cited by
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01 Sep 2009
TL;DR: In this article, a comparison of the main existing tire/road contact models was made, which aimed at modeling the hydroplaning phenomenon taking into account the load transfer between the rear and the front wheels, the water depth on the road, the skid resistance before total hydroplans, and the vehicle characteristics (tire, pressure, load, etc.).
Abstract: The frictional forces developed between the tire and wet pavement have a great effect on the safety of vehicles. This paper exposes the results of a study, which aims at modeling the hydroplaning phenomenon taking into account the load transfer between the rear and the front wheels, the water depth on the road, the skid resistance before total hydroplaning. A part of this work was funded by the PREDIT 3 (IRCAD project). In a first step, a comparison of the main existing tire/road contact models was realized. This work aimed at evaluating the models regarding the hypothesis made (parameters needed, physical properties taken into account or not). This bibliographical study concluded on the fact that the speed of the vehicle, the tires' characteristics (pressure, contact area, tread depth) the load, the water depth, the road profile and macrotexture were the most important parameters that should be included in a global hydroplaning model. Among these parameters, the water depth seems to be the most difficult to evaluate considering the fact that it deeply depends on the pavement irregularities (roughness and texture), the road geometry and the weather (rainfall intensity). That's why the French Regional Laboratory of Road and Bridges of Lyon proposes in a second step a model, which calculates the water depth by taking into account the geometry and the macrotexture of the road. A device called VANI measures the longitudinal slope, the transversal slope, the radius of curvature and the macrotexture of the road each meter. Thus, a vector is calculated each meter giving the main direction of the water flow. The individual vectors are added in view of determining the line of the water flow all along the road. Thus, it is possible to obtain cartography of the road containing the main water flow lines, the tops and the bottoms where the water is accumulating. The lengths of these lines are then used for the calculus of the water depth depending on the rainfall intensity and the road macrotexture. An experimental validation is realized by using a captor measuring the real water depth on the road. In a third step, this initial water depth is used in a bicycle model, which describes the longitudinal dynamics phenomenon. The load transfer between the front and the rear axles is calculated in straight line taken into account the skid resistance of the road (Longitudinal friction coefficient) and the driver behavior (acceleration, braking). Moreover, the water depth behind the rear tire is calculated by considering the water displacement generated by the front tires. The, the increase of the water thickness just behind the tire due to the flow in the tire tread and the pavement macrotexture is modeled with Navier stokes equations. Finally, this model provides a hydroplaning speed depending both on the infrastructure characteristic (geometry, skid resistance) and the vehicle characteristics (tire, pressure, load), which is used for warning the drivers.

16 citations

Journal ArticleDOI
TL;DR: Water film depth (WFD) is an important factor for road traffic safety because of its direct connection with skid resistance, hydroplaning speed, and the tendency of splash and spray.
Abstract: Water film depth (WFD) is an important factor for road traffic safety because of its direct connection with skid resistance, hydroplaning speed, and the tendency of splash and spray. Increasing the...

7 citations

Journal ArticleDOI
TL;DR: In this paper, the pore clogging of double-layer drainage asphalt pavement is mainly attributed to the accumulation of small-sized clogging substances centered on the large-sized ones.

5 citations

Journal ArticleDOI
01 Dec 2020
TL;DR: In this paper, a simulation model for predicting pavement alignment is proposed to obtain the water distribution influenced by pavement alignment design under the current situation of highway reconstruction and extension in China, and the simulation model is used for predicting pave...
Abstract: To obtain the water distribution influenced by pavement alignment design under the current situation of highway reconstruction and extension in China, a simulation model for predicting pave...

4 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used ANSYS finite element software to conduct multi-field coupling analysis of fluid and temperature for OGFC-13 asphalt mixtures with different porosities, pore structures, and different temperatures.

4 citations